title: Generation of ultra-narrow, stable and tunable millimeter- and terahertz- waves with very low phase noise.
abstract: The interference between two spectral lines of the frequency comb of a fiber femtosecond laser is used to generate millimeter-wave and terahertz tones. The two lines are selected by stimulated Brillouin scattering (SBS) amplification. All other modes are strongly rejected based on polarization discrimination, using the polarization-pulling effect that is associated with SBS. The inherent high spectral quality of a femtosecond fiber laser comb allows generation of millimeter- and terahertz waves with linewidths below 1 Hz, and a phase noise of -105 dBc/Hz at 10 kHz offset. The generation, free-space transmission and detection of continuous waves at 1 THz are demonstrated as well. Lastly, the generated millimeter-wave carriers are modulated by 40 Gbit/s data. The entire system consists of a fiber laser and standard equipment of optical telecommunications. Besides metrology, spectroscopy and astronomy, the method can be utilized for the emergent field of wireless millimeter-wave and THz-communications at ultra-high data rates.
authors.forename: Stefan
authors.initials: S
authors.lastname: Preußler
authors.forename: Norman
authors.initials: N
authors.lastname: Wenzel
authors.forename: Ralf-Peter
authors.initials: RP
authors.lastname: Braun
authors.forename: Nina
authors.initials: N
authors.lastname: Owschimikow
authors.forename: Carlo
authors.initials: C
authors.lastname: Vogel
authors.forename: Anselm
authors.initials: A
authors.lastname: Deninger
authors.forename: Avi
authors.initials: A
authors.lastname: Zadok
authors.forename: Ulrike
authors.initials: U
authors.lastname: Woggon
authors.forename: Thomas
authors.initials: T
authors.lastname: Schneider